Here's the Supreme Court Nomination blog, a sister element of SCOTUSblog.
Why am I posting this? Because rumblings coming down the pipe off RealClearPolitics have suggested that it will be Sandra Day O'Connor, not Reinquist, who starts the retirement/replacement circus in motion. It true, it means
a) a HUGE political fight (and one for which the Democrats, paradoxically are itching, even though a fight of this magnitude plays directly into Replublican mid-term election hands. Court nominees are a serious motivator for the Republican base, and a big reason for why Daschle got tossed out. There is no conceivable better way of guaranteeing an increase in the Senate for the Republicans than a SCOTUS fight).
b) the potential for the traditional 5-4 balance to finally go away in favor of a 6-3 stable court, which hasn't existed for most of my lifetime. You have to go back to the stable days of the Warren court for that.